WO2014166736A1

WO2014166736A1 - Twin clamp device

Info

Publication number: WO2014166736A1
Application number: PCT/EP2014/056001
Authority: WO
Inventors: Ulrich Rattunde
Original assignee: Rattunde & Co Gmbh
Priority date: 2013-04-10
Filing date: 2014-03-25
Publication date: 2014-10-16
Also published as: US20160082572A1; EP2983854A1; CN105246630B; US9676080B2; CA2909156A1; EP2983854B1; DE102013103587B3; CN105246630A; JP6206744B2; CA2909156C; MX370869B; MX2015014277A; JP2016518995A; ES2644792T3

Abstract

The invention relates to a twin clamp device for two consecutively-arranged longitudinal profiled sections (2, 3) aligned in a longitudinal direction (L), comprising a first individual clamp device (71) that has an inner first (56) and an outer first clamping jaw (55), and a second individual clamp device (72) that has an inner second (58) and an outer second clamping jaw (57), these being mechanically coupled to one another by means of at least one first moveably mounted (62) and at least one second moveably mounted clamping lever (63), said at least one first clamping lever (62) being functionally connected to the inner first (56) and the outer first (55) clamping jaw, and the at least one second clamping lever (63) being functionally connected to the inner second (58) and the outer second clamping jaw (57), as well as at least one first spring device (60) that pushes the inner first (56) and the outer first clamping jaws (55) apart against a force exerted by the at least one first clamping lever (62), and at least one second spring device (60') that pushes the inner second (58) and the outer second clamping jaws (57) apart against a force exerted by the at least one second clamping lever (63).

Description

twin tensioner

The invention relates to a twin clamp for two juxtaposed longitudinal profiles aligned in a longitudinal direction. In modern sawing systems long profiles, especially metal pipes are cut to high precision. For feeding the metal pipes as well as for holding the metal pipes during the actual sawing clamping means are used. Clamping devices are known in the form of single or double clamps in the prior art. For single or double clamps, the tubes are clamped under direct contact with each other.

In CH 413 751 A a device for the centric clamping of cylindrical or approximately cylindrical workpieces is disclosed, but with the disadvantage not two pipes can be clamped simultaneously.

From US 2006/0255521 A1 a double clamping device for two pipes is known, which allows the manual clamping two pipe pieces, the jaws are precisely adapted to the curves of the clamped pipe sections and therefore tubes with different diameters can not be clamped with the same jaw. On the other hand changes the position of the central axis in the space when clamping pipes of different diameters, so that a machine post-processing z. B. for a high-precision cutting is not possible with sufficient precision.

Furthermore, twin clamps are known which allow a simultaneous, but non-contact clamping of two tubes. However, the known twin clamps have significant disadvantages.

One type of the known and developed by the applicant Zwillingsspanners comprises an intermediate clamping piece and two mutually movable outer clamping jaws. When advancing the tube through the twin tensioner, however, the tube outer surfaces are easily scratched. In addition, the center distance between the two tubes changes with changing tube diameter.

Another type also known from the applicant of a known Zwillingsspanner has two double clamping jaws, which are movable against each other, the clamping effect, however, very sensitive depends on the same pipe diameter. It is an object of the present invention to provide a Zwillingsspanner available, which eliminates the above-mentioned disadvantages.

The problem is solved by a Zwangssspanner mentioned above. The twin clamp has a first single clamp having inner first and outer first clamps and a second clamp having inner and outer second clamping jaws. The two individual clamps are mechanically coupled to each other via at least one first movably mounted and at least one second movably mounted clamping lever, and the at least one first clamping lever is in operative connection with the inner first and the outer first clamping jaw, while the at least one second clamping lever is connected to the inner second and the outer second jaw is operatively connected. It is further provided at least a first spring means which presses apart the inner first and outer first jaw against a force exerted by the at least one first clamping lever force and at least one second spring means having an inner second and an outer second jaw against one of the at least one second Tension lever applied force apart.

The at least one first spring device and at least one second spring device and the first and second clamping lever together with common clamping lever bolt existing coupling between the two individual tensioners is conveniently designed so that contact surfaces concentric open and close to the tubes, so that the twin clamp in the open state Pushing through the pipes without scraping on the contact surfaces allows. In addition, the twin clamp is suitable for simultaneous clamping of pipes of different outer diameter, whereby both pipes can be tightened tightly. In addition, regardless of the pipe diameter, the center distance of the two tubes is the same.

Preferably, the first and second clamping levers are supported on the back against each other. They therefore do not need to be stored additionally.

In a preferred embodiment of the invention, the at least one first clamping lever and the at least one second clamping lever are rotatably mounted about a common axis. The common axis may be guided by a clamping lever bolt, which is preferably freely movable. Conveniently, the common axis with respect to a Zentrischspanner on which the Zwillingsspanner is mounted, freely movable, ie, that the axis is not fixed to a housing or the Zentrischspanner, but is basically free to move during the clamping operation. Conveniently, the clamping lever bolt is not stored.

In a preferred embodiment of the invention, the at least one first clamping lever abuts the inner first and the outer first clamping jaw, and the at least one second clamping lever abuts against the inner second and the outer second clamping jaw. Conveniently, the clamping levers are not in firm contact with the clamping jaws, but form only by support a connection for transmitting power between the bearing surface of the clamping lever and clamping jaw.

Preferably, the first clamping lever and the second clamping lever each have a mirror symmetry plane. As a result, the clamping levers are particularly inexpensive to produce.

Preferably, the first and second individual clamps are arranged on a Zentrischspanneranordnung. The Zentrischspanneranordnung favorably has two supports, which are moved symmetrically in a clamping direction perpendicular to the longitudinal direction against each other. On each of the two supports one of the individual clamps is mounted, which are connected via the coupling mechanism in operative connection.

The invention will be described with reference to an embodiment in ten figures. Showing:

1 shows a perspective view of a known twin clamp, FIG. 2 shows a front view of the twin clamp in FIG. 1, FIG. 3 shows a further known twin clamp in a perspective view, FIG. 4 shows a front view of the known twin clamp in FIGS. 3, 5 a component view of a twin clamp according to the invention,

6 shows the twin clamp in FIG. 5 in a perspective view, FIG. the twin clamp with two clamped pipes,

8 is a sectional view in Fig. 6 with two diameter-maximum and equal-sized pipes in the tensioned state,

9 is a sectional view in Fig. 6 with two minimal tubes in the open state,

Fig. 10 is a sectional view corresponding to FIG. 9 with two tubes with different diameter in the tensioned state.

The illustrated in Fig. 1 known Zwangssspanner 1 is for clamping two Larigprofilen, especially long metal profiles, preferably metal tubes 2, 3 determined. The two tubes 2, 3 are aligned in a longitudinal direction L, and they are arranged parallel to each other at a distance from each other. The twin clamp 1 has a central perpendicular to a perpendicular direction in a clamping direction S to the longitudinal direction L of the tubes 2, 3 extending groove 4, in which a saw blade 6 is inserted during the cutting process and the two tubes 2, 3 cuts.

Fig. 2 shows the twin clamp 1 in a front view. It comprises a first clamping jaw 10 and a second clamping jaw 11, which are perpendicular to the longitudinal direction L of the tubes 2, 3 in the clamping direction S against each other. For this purpose, the first and second clamping jaws 10, 11 are arranged on a (not shown) Zentrischspanneranordnung, which allows a symmetrical method of the clamping jaws 10, 11 in the clamping direction S. Between the first clamping jaw 10 and the second clamping jaw 11, a movable intermediate clamping piece 13 is provided. Two first contact surfaces 20, 21, for the first tube 2 and two second contact surfaces 22, 23 for the second tube 3 on the first 10 and the second clamping jaw 11 and along the intermediate clamping piece 13 are each formed prismatic, d. h., That they have a deviating from the circular shape, more funnel-shaped shape, so as to allow the rotationally fixed clamping different tubes 2, 3 different diameters D1, D2.

The distance in the clamping direction S between the two tubes 2, 3 is determined by the geometry of the intermediate clamping piece 13 and by the Rohrdurmesser D1, D2. With the twin clamp 1 tubes 2, 3 different diameters D1, D2 can be clamped in different clamping operations. The tubes 2, 3 may also have a different diameter D1, D2 in a clamping operation. One Clamping range of the twin clamp 1 is about five to ten millimeters, that is, it can be clamped tube diameter between, for example, D1 = D2 = 31, 5 mm to 36.5 mm.

A disadvantage of the twin clamp 1 is that the distance A between tube axes of the diameter D1, D2 of the tubes 2, 3 depends. In order to keep the distance A between different clamping operations with different diameters D1, D2 tubes 2, 3, one needs for each tube diameter D1, D2 a separate intermediate clamping piece 13. Furthermore, it is disadvantageous that by external diameter tolerances of the tubes 2, 3 fluctuations in Center distance arise, which are disadvantageous for subsequent machining operations in particular chamfering. The two cut-to-length pipe sections are transported further in the center distance and subjected to the subsequent machining while maintaining the center distance. Usual outside diameter tolerances are about ± 0.1 mm. This leads to a deviation of the axial distance A of the tubes 2, 3 at a diameter D1 = D2 = 34 mm of A = 34 mm ± - 0.1 mm and to a tolerance in the axial distance A of about 0.29 mm and an asymmetry E of about 0.4 mm.

Another problem is that the intermediate clamping piece 13 does not lift off the tubes 2, 3 when the twin clamp 1 is opened in order to advance the tubes 2, 3 and therefore scratch the outer walls of the tubes 2, 3 during insertion. The feed takes place with the help of a (not shown) pliers inserter.

Here, too, the supply of the two tubes 2, 3 by a not shown Zangeneinbschieber in the twin clamp 1. Again, a perpendicular to the longitudinal direction L in the clamping direction S extending groove 4 is provided for the saw blade 6 ,

The twin clamp 1 has a first and a second double clamping jaw 30, 31, which are mounted on a Zentrischspanner, not shown. In the twin clamp 1, the axial distance A is always constant over the entire diameter clamping range. The problem is that the twin tensioner is overdetermined. That is, if the first tube 2 in the diameter D1 is slightly smaller than the second tube 3 in diameter D2, only the larger in diameter D2 tube 3 is securely clamped and vice versa The diameter tolerances can only by elastic deformation of the tubes 2, 3 and / or of the twin clamp 1, for example by at least one spring-loaded contact surfaces 20, 21, 22, 23. The twin clamp 1 can only be used for very narrow diameter tolerances. The usually occurring tolerances of + 0, 1 mm can not be compensated with the twin tensioner 1. The twin tensioner 1 according to the invention is shown in a component view in FIG. It has a Zentrischspanner 50 with a first and a second support 51, 52 which are exactly symmetrical in the clamping direction S against each other moved back and forth. Furthermore, the twin clamp 1 has a first outer 55 and a first inner 56 and a second outer 57 and a second inner clamping jaw 58, which together form a spring-loaded connection with each other via guide pins 59 and two first compression spring bolts 60 and two second compression spring bolts 60 '. The two inner jaws 56, 58 are coupled together by a coupling mechanism, which here consists of two kits, each kit comprises a clamping lever pin 61 and a first 62 and a second 63 clamping lever. Furthermore, the first and the second tube 2, 3 are shown, which are to be clamped.

In Fig. 6, the twin clamp 1 of Fig. 5 is shown in an assembled state. The first outer 55 and the first inner jaw 56 are components of a first single clamp 71, the second outer 57 and the second inner jaw 58 are components of a second single clamp 72. The first single clamp 71 is on the first support 51 and the second single clamp 72 is mounted on the second support 52 of the Zentrischspanners 50. The Zentrischspanner 50 allows a perpendicular to the longitudinal direction L of the tubes 2, 3 in the clamping direction S exactly symmetrical divergence and succession-to-process of the two supports 51, 52. Fig. 6 shows the first tube 2 and the second tube 3, clamped in first 71 and in the second individual tensioner 72nd

Fig. 7 shows the arrangement of the twin tensioner 1 according to the invention in a pipe cutting machine in a schematic view. The saw blade 6 is arranged outside the twin clamp 1 over the groove 4 formed over the entire transverse extension in the clamping direction S of the twin clamp 1. The saw blade 6 is einlassbar in the groove 4 and cuts when inserting the two tubes 2, 3 by. The tubes 2, 3 are preferably metal tubes. The tubes 2, 3 are pushed in Fig. 7 from left to right by the Zwilling spanners 1, tightened in Zwilling spanners 1 and cut to length. Elongated pipe sections are removed on the right in Fig. 7 by means of a (not shown) gripping device. They are conveyed while maintaining their center distance A and further processed. For feeding the two tubes 2, 3 in the longitudinal direction L to the twin tensioner 1 a Zwanzsspanner 1 is substantially identical Zangeneinschieber 80 is provided. Opposite the twin clamp 1, the forceps inserter 80 has two conical shaped inlets 81, 82 for the tubes 2, 3 on. The forceps inserter 80 can be moved back and forth in the longitudinal direction L by means of a traversing device (not shown) and thus enables the tubes 2, 3 to be supplied in clocked fashion to the twin clamp 1 for sawing off.

FIG. 8 shows the twin clamp 1 of FIGS. 6 and 7 in a sectional view along two compression spring bolts 60, 60 'and perpendicular to the longitudinal direction L and clamping direction S. The first and the second tube 2, 3 in Fig. 8 are equal in outer diameter and maximally formed, d. That is, a larger pipe diameter can not be clamped by the illustrated twin clamp 1. Fig. 8 shows the twin clamp 1 in a closed state, while Fig. 9 shows the twin clamp 1 in an open state. In the closed state, the tubes 2, 3 are clamped, and there is the actual cutting process by means of the saw blade 6 instead. Fig. 9 shows a sectional view along the guide pin 59, the cutting plane is perpendicular to the longitudinal direction L and the clamping direction S.

In the opened state in Fig. 9, the tubes 2, 3 are advanced by means of the forceps inserter 80 by the desired length of the tube section to be cut off. When advancing the Rohraußenwandungen touch any of the contact surfaces 20, 21, 22, 23 and therefore can not scratch.

FIG. 8 shows that the first and second tensioning levers 62, 63 are rotatably mounted around the common tensioning lever pin 61. The clamping lever bolt 61 is free, that is, it is freely movable relative to the Zentrischspanner 50, and in particular its ends are not supported in a fixed position. The second clamping lever 63 has, as FIG. 5 shows, a recess into which the first clamping lever 62 is inserted. By two central holes of both clamping levers 62, 63 of the common clamping lever pin 61 is guided. The first individual clamp 71 has the first outer clamping jaw 55 and the first inner clamping jaw 56, the first clamping lever 62 is movably on the inside outer walls of the first outer clamping jaw 55 and the first inner clamping jaw 56. The first outer clamping jaw 55 and the first inner clamping jaw 56 are spring-loaded connected to each other by the two pressure spring bolts 60, which presses apart the two clamping jaws 55, 56. The compression spring bolts 60 press the first inner clamping jaw 56 against an arm 62a of the first tensioning lever 62 facing away from the centric clamping device 50 in the direction of the second individual tensioner 72. The first tensioning lever 62 is moved on its rear side of the coupled thereto second clamping lever 63, which exerts a force on the first clamping lever 62, held in position. The same applies to the second tensioning lever 63 of the second individual tensioner 72. The first tensioning lever 62 rotates somewhat in the clockwise direction and a centric tensioner 50 facing arms 62b of the first tensioning lever 62 abuts against an inner wall of the first outer clamping jaw 55.

In order to release the twin clamp 1, the two supports 51, 52 are moved apart symmetrically, ie the first outer clamping jaw 55 shown in FIG. 8 is turned outwards, ie in FIG. 8 to the left and the second outer clamping jaw illustrated in FIG 57 is moved to the outside, ie in Fig. 8 to the right. Due to the spring force of the first pressure spring bolts 60, the first inner clamping jaw 56 is pressed in the direction of the second individual tensioner 72. The first clamping lever 62 thus receives a game to turn a little way clockwise, so far until the centric tensioner 50 facing arm 62b again comes into contact with the first outer clamping jaw 55. By turning the first tensioning lever 62, the first compression spring bolt 60 relaxes again to move the first inner tensioning jaw 56 somewhat in the direction of the second individual tensioner 72. The state of the opened first single clamp 71 is shown in FIG. The analogous applies to the opening of the second single vice 72. Advantageously, the twin clamp 1 opens in such a way that the respective two contact surfaces 20, 21 or, 22, 23 symmetrically detached from the first 2 and second tube 3 and when pushing through the tube 2, 3 by the open contact surfaces 20, 21, 22, 23 no scratch marks on Rohraußenwandungen can arise. The twin clamp 1 according to the invention is also suitable for clamping tubes 2, 3 of significantly different diameters D1, D2, as shown in FIG. 10. The cut surface also extends along the guide pin 59, and it is perpendicular to the longitudinal direction L and to the clamping direction S. There, the first tube 2 in diameter D1 is smaller than the second tube 2. Although the two outer supports 51. 52 by 52 Zentrischspanner shifted equally far inward or outward, the deviation in the pipe outer diameter, however, can be compensated by the movable arrangement of the coupling mechanism of the first and second clamping levers 62, 63 and clamping lever pin 61. Due to the spring loading by the second compression springs 60 ', the inner second jaw 58 is slightly more inwardly insane than the inner first jaw 56 when it firmly clamps the second tube 3. As a result, the entire coupling system 61, 62, 63 tilts slightly counterclockwise, and the axis of rotation of the tension lever pin 61 moves a little to the left to the first single clamp 71st As a result, the upper arm 62 a of the first clamping lever 62 is also slightly shifted in the direction of the first single clamp 71 in Fig. 10 to the left and clamps the first smaller diameter in the tube 2 a fixed. It is essential that the axial distance A of the two tubes 2, 3 always remains the same He is between the two tubes 2, 3 with a minimum diameter D1 = D2 = min as shown in FIG. 9 as large as between the two tubes 2, 3 with a maximum diameter D2 = D2 = max as shown in FIG. 8 and the same size as in the tubes 2, 3 with different diameter D1 D2 in FIG. 10th

LIST OF REFERENCE NUMBERS

1 twin vice

2 metal pipe

3 metal raw r

4 groove

6 saw blade 10 first clamping jaw

1 1 second clamping jaw

13 movable intermediate clamping piece

20 first contact surface

21 first contact surface

22 second contact surface

23 second contact surface

30 first double clamping jaw

31 second double clamping jaw

50 centric clamps

51 first support

52 second support

55 first outer jaw

56 first inner jaw

57 second outer jaw

58 second inner jaw 59 guide pin

60 first compression spring bolt

60 'second compression spring bolt

61 Tension lever bolt

62 first clamping lever

62a arm

62b arm 63 second clamping lever

71 first single tensioner

72 second single clamps

80 forceps inserter

81 Introduction

82 Introduction

A center distance

D1 pipe diameter

D2 pipe diameter

E asymmetry

L longitudinal direction

S clamping direction

Claims

claims

1. Twin clamp for two juxtaposed in a longitudinal direction (L)

aligned long profiles (2, 3) with

a first individual tensioner (71) having an inner first (56) and an outer first clamping jaw (55), and

a second individual tensioner (72) having an inner second (58) and an outer second clamping jaw (57),

which are mechanically coupled to each other via at least one first movably mounted (62) and at least one second movably mounted clamping lever (63), wherein

the at least one first clamping lever (62) is in operative connection with the inner first (56) and the outer first (55) clamping jaw and

the at least one second clamping lever (63) is in operative connection with the inner second (58) and the outer second clamping jaw (57), and

with at least one first spring device (60), the inner first (56) and the outer first clamping jaw (55) against one of the at least one first clamping lever

(62) forces the applied force apart, and

at least one second spring device (60 ') connecting the inner second (58) and the outer second clamping jaw (57) against one of the at least one second

Clamping lever (63) forces apart applied force.

2. twin clamp according to claim 1,

characterized in that the first and second clamping levers (62, 63) are formed on the back supporting each other.

3. twin clamp according to claim 1 or 2,

characterized in that the at least one first clamping lever (62) and the at least one second clamping lever (63) are rotatably mounted about a common axis.

4. twin clamp according to claim 3,

characterized in that the common axis with respect to the

Zwillingsspanner (1) is free to move.

5. twin clamp according to one of claims 1 to 4,

characterized in that the at least one first tensioning lever (62) on the inner first (56) and the outer first clamping jaw (55) and the at least one second clamping lever (63) on the inner second (58) and the second clamping jaw (57) rests.

6. twin clamp according to one of claims 1 to 5,

characterized in that the first clamping lever (62) and the second clamping lever (63) each have a mirror symmetry plane.

7. twin clamp according to one of claims 1 to 6,

characterized in that the first and the second individual clamps (71, 72) are arranged on a Zentrischspanner (50).